Performance of 1REC-MHPM in the presence of adjacent channel interference

The effect of adjacent channel interference (ACI) on the error probability of the rectangular frequency pulse multi-h phase-coded modulation (1REC-MHPM) is studied. Evaluations through simulation were done for different values of the absolute adjacent channel frequency spacing |/spl Delta/f|, different time delay /spl tau/ between the main channel and the interfering channel, and schemes with different number of modulation indexes. It is found that ACI effects can only be eliminated when |/spl Delta/f| approaches 2.0. Comparison with minimum shift keying (MSK) is also made through simulation.